Example code that demonstrates how stack-chain will blow up if an error has been made non-extensible for some reason.

stack-chain-preventExtensions-test.js

function createNonExtensibleError() {
  var error = new Error("I am a non-extensible error");
  Object.preventExtensions(error);
  return error;
}

function handleError(e) {
  console.log("\nERROR: " + e.message);
  console.log("--- STACK TRACE BEGIN ---");
  console.log(e.stack);
  console.log("--- STACK TRACE END ---");
}

// Demonstrate that raising a non-exentensible error is safe.
try {
  throw createNonExtensibleError();
} catch (error) {
  handleError(error);
}

// The above results in output like this:
//
// ERROR: I am a non-extensible error
// --- STACK TRACE BEGIN ---
// Error: I am a non-extensible error
//     at createNonExtensibleError (/home/rlm/ws/stack-chain-test/test.js:2:15)
//     at Object.<anonymous> (/home/rlm/ws/stack-chain-test/test.js:16:9)
//     at Module._compile (module.js:435:26)
//     at Object.Module._extensions..js (module.js:442:10)
//     at Module.load (module.js:356:32)
//     at Function.Module._load (module.js:311:12)
//     at Function.Module.runMain (module.js:467:10)
//     at startup (node.js:136:18)
//     at node.js:963:3
// --- STACK TRACE END ---




// Now require stack-chain....
var chain = require('stack-chain');

// Demonstrate that non-extensible errors blow us up
try {
  throw createNonExtensibleError();
} catch (error) {
  handleError(error);
}

// The above results in output like this:
// 
// ERROR: I am a non-extensible error
// --- STACK TRACE BEGIN ---
// /home/rlm/ws/stack-chain-test/test.js:10
//   console.log(e.stack);
//                ^

// TypeError: Cannot define property:callSite, object is not extensible.
//     at Function.defineProperty (native)
//     at Error.Object.defineProperty.set (/home/rlm/ws/stack-chain-test/node_modules/stack-chain/stack-chain.js:177:12)
//     at Function.prepareStackTrace (/home/rlm/ws/stack-chain-test/node_modules/stack-chain/stack-chain.js:123:20)
//     at handleError (/home/rlm/ws/stack-chain-test/test.js:10:16)
//     at Object.<anonymous> (/home/rlm/ws/stack-chain-test/test.js:28:3)
//     at Module._compile (module.js:435:26)
//     at Object.Module._extensions..js (module.js:442:10)
//     at Module.load (module.js:356:32)
//     at Function.Module._load (module.js:311:12)
//     at Function.Module.runMain (module.js:467:10)


console.log("This code never executes, because stack-chain throws an error.");